It is estimated that 220 million women around the world do not have access to contraceptives or information on them.
In some countries women need written consent from their husbands before they can talk to a doctor about contraception while in others, family planning services are not offered to adolescents or unmarried women.
In developing countries, contraceptives are frequently out of stock when women try to get them.
Delegates at the summit are hoping to get 120 million women better access to contraceptives, information and services by 2020.
More top news
The Facebook founder revealed the plan as he and wife Priscilla Chan announced the birth of their baby daughter, Max.
At least 300 people are actively promoting and recruiting for the terror group from within the United States, academics have found.
Hollywood film director and actor Steven Seagal has been asked to train Serbian special forces in martial arts.